package com.wangxuan.config.security.component;

import com.wangxuan.config.security.component.JwtTokenUtil;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.security.authentication.UsernamePasswordAuthenticationToken;
import org.springframework.security.core.context.SecurityContextHolder;
import org.springframework.security.core.userdetails.UserDetails;
import org.springframework.security.core.userdetails.UserDetailsService;
import org.springframework.security.web.authentication.WebAuthenticationDetailsSource;
import org.springframework.web.filter.OncePerRequestFilter;

import javax.servlet.FilterChain;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

/**
 * JWT 登录授权过滤器
 */
public class JwtAuthencationTokenFilter extends OncePerRequestFilter {
    @Value("${jwt.tokenHeader}")
    private String tokenHeader;
    @Value("${jwt.tokenHead}")
    private String tokenHead;
    @Autowired
    private JwtTokenUtil jwtTokenUtil;
    @Autowired
    private UserDetailsService userDetailsService;
    @Override
    protected void doFilterInternal(HttpServletRequest request, HttpServletResponse response, FilterChain chain) throws ServletException, IOException {

        System.out.println(this.tokenHeader);
        String authHeader = request.getHeader(this.tokenHeader);
        System.out.println("不存在token");
        System.out.println(authHeader);
        //存在token
        if (null != authHeader && authHeader.startsWith(this.tokenHead)) {

            String authToken = authHeader.substring(this.tokenHead.length());
            String username = jwtTokenUtil.getUserNameFormToken(authToken);

            System.out.println("存在token");
            System.out.println(authToken);
            System.out.println(username);
            //token中存在用户名但未登录
            if (null!=username&& null==SecurityContextHolder.getContext().getAuthentication()){
                //登录
                UserDetails userDetails = this.userDetailsService.loadUserByUsername(username);
                //验证token是否有效，重新设置用户对象
                if (jwtTokenUtil.validateToken(authToken,userDetails)){
                    UsernamePasswordAuthenticationToken authentication =
                            new UsernamePasswordAuthenticationToken(userDetails, null, userDetails.getAuthorities());
                    authentication.setDetails(new WebAuthenticationDetailsSource().buildDetails(request));
                    SecurityContextHolder.getContext().setAuthentication(authentication);
                }
            }
        }
        chain.doFilter(request,response);
    }



}
